Why $pear->packageExists() returns always false on installed package?

问题

I installed Mail (http://pear.php.net/package/Mail) by

pear install Mail

everything seems to be ok, but checking for this package programmatically:

$pear = new PEAR_Registry();
$enabled = $pear->packageExists('Mail');

always fails for me (false).

Could someone give me any advice?

If I try to install Mail once again, I am getting:

pear/Mail is already installed and is the same as the released version 1.2.0
install failed

My include_path settings:

include_path = ".;C:\Program Files (x86)\IIS Express\PHP\v5.3\pear;"

Mail package was installed to C:\Program Files (x86)\IIS Express\PHP\v5.3\pear\Mail dir

Reinstall Mail didn't help

回答1:

I think you're using the wrong registry file.

Try to pass the PEAR installation directory as first parameter to the PEAR_Registry constructor. It's the directory in which the .registry directory exists, e.g. /usr/share/php/.

来源：https://stackoverflow.com/questions/16397770/why-pear-packageexists-returns-always-false-on-installed-package